Comminuting-mill



R. C. NEWHGUSE.

COMNHNUTING MILL..

.APPLICATION HLED Aucas, 19u11.

13,8919334., Patented Oct. 18, 19521 mar/wm aura sr TENT "013km,

RAY C. NEVHOUSE, l? WUVTATSA, WSCONSINJASSIGNOR T ALXS-CHALMERS MANUFACTURING CQMPANY, 0l? MILWAUKEE, WISCONSIN, A CORPOR'TIGN F nat,atraen.l

Specicatlon Aof Letters Patent.

COMMXNUTJINGPVULL.

Application tiled August 23, 1917. Serialv No. ltl.

To r// whom. t may con/*ern Be itknoun that I, RAY C. Nnwnoosn, a citizen ot the `United States, residing at Wauwatosa` in the county of lt'lilv'aukee and State ot `Wisconsin, have invented certain new and useful Improvements in Comminuting-lll'ills, of which the following is a specification:

'l` his invention relates to improvements in the construction ot mills for comminutinp; cement-.making materials, coal. rock, ore and the like, and has particular relation to improvements in that type of comminuting mills known as combination mills.

An object ot the invention is to provide a comminuting mill of the combination type, which is simple and compact in construe tion and etlicient in operation. Another l object of the invention is to impro've the construction and operation of mills of the type disclosed in and the features oit which are claimed broadly in application Serial No. 123,783, tiled October 2, 1916.

One of the more specific objects of the invention is to provide a combination v,mill in which there is ample screening capacity between the successive comminutin` chambers.

Another specific object is to provide a single means between two successive cham` bers of a combination mill, which Willeiieo tively serve both as a holdback for the grinding bodies and as a in'e screening device for the discharge from the iirst chamber.

bodiments of the invention may be had by referring to the drawing accompanying and forming a part ot this specification in which like reference characters designate the same or similar parts in the various views.

Figure 1 is a central vertical section through a combination mill embodying a division partition which is adjustable along the length of the mill in order to vary the volumetric capacities of they several grinding chambers.

Fig. 2 is an enlarged fragmentary central vertical section through a combination mill ot the dry type.

Fig. 3 is an enlarged fragmentary trans` verse vertical Section through the mill, the section being taken along the line Illlll of Figi 2 looking in the direction ot' the arrows.

Fig. 4 is an enlarged fragmentary central vertical section through a combination mill of the wet type.

The combination mill illustrated in the drawing comprises a rotary shell 1 having feed and discharge end heads 2, 3 respectively, and provided with an adjustable vpartition dividing'the shell intocoarse and tine. grinding chambers 5, (i respectively. The mill is rotatably mounted in trunnion bearings 7, 8 and is adapted to bel rotated by power applied to a driving gear 9, in the usual manner.

The coarse grinding Achamber 5 is ordi Patented @ce 18, 19251.

narily filled substantial]t7 to the center line of the shell 1, with relatively large comminuting bodies or ballslO, while the tine grinding or finishing chamber 6 is likewise ordinarily half filled ,with relatively small comminuting bodies or balls 11B The balls 10, 11 are preferably formed of iron or other material having similar characteristics. The coarse grinding chamber 5 receives its supply of relatively coarse material through a feed trunnion T0 and delivers the material in partially reduced condition, through a comu bined holdbaclr and sizingscreen and past the division partition, to the iinishing cham ber 6 from which the finished prod-uct is delivered through a discharge screen 29 upon elevating vanes 12 which discharge the material from the mill through the discharge trunnion 80. I The combined holdback and screening de. vice comprises a screen consisting of ananvv:cular series of spaced bars 14: extending A further specific object is to provide means whereb the sizing yscreen and the division partition may be simultaneously adjusted longitudinally7 of the mill.

- Still another specic object is to provide a durable, readily manufactured and readily renewable device for screening the material discharged from one of the grinding chambers and delivered into a. subsequent grinding.,Y chamber. I

Still another specific object is to provide means applicable especially to so-called Wet grinding combination mills utilizing' positive feeders, for preventing the feeding means between the successive chambers from pumping.,r one of the chambers dry.

Some of the novel features disclosed but not specifically claimed herein it'orm the subject of Patent No. 1,361,281, granted December 7, 1920.

A clear conception of several of the emlongitudinally of the shell 1 and detacbibiy secured to a cast element 28 by nieans of an end retaining ring 1T and a' front partition plate 18. The bars 14C are preferably fixedly spaced by means-oi distance pieces 30, 31

. secured to the bar ends by welding or rivetperiphery of the shell 1. The ribs 15 arey connected by a ringv 16 which also forms a continuous support for the m1d portions of the screen bars .,1et. The screen bars 1l are so spaced by the pieces 3l), 31. that any material passing therebetween is sullicicntliy fine to be further reduced by the relatively small grinding bodies in the finishing chamber 61 The bars 14C are preferablyl formed ot' Wear-resisting material such as tool steel and may be formed by merely sawing or otherwise cutting bars of commercial tool steel into the proper lengths. and securing the distance pieces `30, 31

thereto.

The division partition comprises a pair of spaced annular plates 18, 2O between which are located aseries'of radial elevated vanes 4, the outer ends of which communicate with the spaces between the successive ribs 15 and the inner ends of which are directed toward a Adischarge cone or element 19. The plates 18, 20, the element 19, and the vanes 1 are firmly detachably united by means of clampin bolts 26.

n the :form of division partition disclosed in Fig. 4l, the plate 2O is provided with one or more annular series of perforations 21, and the plate 1 8 mayu be provided with similar perforations 25, the latter', however, being unnecessary. The perforations 21, 25 are preferably formed tapering away from the elevating vanes 4.` in order to prevent clogging.

The coarse grinding chamber 5 is providedwith relatively thick sec-tional liners 22, the liners directly adjacent the discharge screen being of less length than the others., as indicated in Fig. .1. The portion of the fine grinding chamber G directly adjacent the division partition is provided with rela# tively thick sectional liners 23 substantially like thev short liners 22. of the chamber The remaining. portion of the chamber b is provided with relatively thin sectional liners 24, the junction of the liners 23, 24 being formed by liners of graded thickness. The liners 22, 23, 24, may be of equal `thickness or they may be of different thicknesses as disclosed. f

During the normal operationof themill,

rotary motion is imparted to the shell 1 and the. relative-ly coarse material is fcd into the mill through the feed trunnion T0. being partially reduced'in the coarse grinding chamber 5 by means ol the balls l0. The partially reduced material passing the screen bars 14 is delivered by the ribs l5 upon the outer ends of the revolving vanes l. elevated and delivered by vthese vaines l through the partition i2() into the line grinding chamber (i.v The material after being .reduced to thc proper linencss in the chamber '(3 passes through the screen QS? upon thc rcvolving vanes 12. which vancs elevate and deliver the final product from the mill through the trunnion Sill.

lf it is desired to var v the relative capaci ties of the chambers (i. this may `be 'donc by adjusting the division partition longitudinally oi" the shell 1. Adjustment ot the division partition may be cti'ccl'cd by removing liners 22. 23 on one side ol' the partitioiror screen and after moving thc partition and screen a. sufficient distance to lill up the gap produced by the removal ot' these liners.. the liners may be inserted in the mill on the opposite side of the adjusted elements. lt will bc noted that by forming thescreen and the partition as disclosed, ample screeninzgr area is provided for thc first chamber and the division partition may be adjusted without changing the relative locations ot the screen and they partition. By forming the screen as an annular scricsj ot' spaced hais 1l, maximum screening capacity vis obtained for minimum length ol bars. The bars 1l ,may be made ol' suliicicnt length to produce the required amount of screening capacity/'anti may be readily formed from cmnmerela stock. By utilizing rthe screen as a holtlback as well as for screening,r purposes,` the 'necessity ot providing r separate devices to perform these functions, is elimi-` nated. rThe screening bars 14 may be readily removed and replaced whenl worn. by merely removing the clamping bolts 2G andl separating the coacting elements.

lt. has been found in the operation of combination mills ot thevwet type wherein being)r a` positive feeding means was utilized between the successive chambers, that this feeding means would pump all of the hquid out of the coarse grinding chamber and would (le-- liver it into the tine grinding chamber. ln order to overcome this difficulty, the division partition may be provided with perforations 21, 25 as disclosed in Fig. Il, thereby permitting liquid to flow back from the fine grinding chamber 6 into the coarse grinding chamber 5. These perforations do not interlc'ereI With the normal feeding and permit return to the first chamber of but al small proportion ot the fine material by the liquid derving therethrough.

lt should be understood that it is not desired to be limited to the exact details of Weense l1. In combination, e rotary shell, a per! `'tition dividing seid sheii into successive chambers having comminntin'g bodies therein,` 'and means :for positively eeding granu- Alor materiel past said 'partition in one dii-eetion, seid partition being formed to permit free flow of-'inidin either direction Without permitting transmission of seid comminuting bodles.

to said axis, said Wsii dividing gpid shell into e plurality of chambers having coniminuting bodies therein, and means 'for vpositiveiy feeding' grenuiar materiai from one of seid eiiembe'rs into another through seid opening, 1seid weil being iorrned to permit free iow of iiuid and oomminuted material iror'n. either of said chambers into the 'other without permitting transgression of said comminuting bodies.`

3. In combination, s rot-ary siieii, n pair of transverse Weils dividing said' slieil into successive chambers, said walisbeing spaced spart longitudinally of said vSbeii to form an intermediate eiiemoer which is free' `from 2. tn coinbn,tion7 e. siiei rotetebieabout en exis, a Wadi having en opening adjacent mediate Chamber iol vrality of openings therethrough adjacent to said shell, said openings being of :1 size adapted to prevent transgression of comminuting bodies to said intermediate chamber.

While permitting the passage of connninnted materiel through eitilier of said Wallis, and means Within said intermediate chamber for elevating material delivered thereto through said openings.

4f. in combination, a rotary sheli, n pair of transverse Weils spaced iongitndinaiiy of said shell and dividing: seid sheii into three sueessive chambers, the Chamber between Seid rinus being" free from eoniminuting bodies :ind the remaining chambers having comminnting bodies therein, eeeii of seid weils haring n plurality of relatively slneii openines therethrough remote 'from the axis of sain shell of a size adapted to prevent. t ansgression of said eon'iminnting bodies to said intermediate chamber but eapzibe oi permitting free How of comminnted mete rial and Huid through seid intermediate "chamber7 and ineens within seid interi elevating granular meterinl delivered thereto and for effecting cascading of the elevated material.

n testimony whe-reni', the signature of the inventor is aiiixed hereto.

RAY C NEW'HOUSE, 

